A movable baffle for radiation calibration in a vacuum ring mold apparatus

Abstract

The utility model provides a movable baffle for radiation calibration in vacuum ring mould equipment, is equipped with base, movable baffle module, drive direction module, limit module, control module, the base is fixed on the bottom test platform of space environment simulation test equipment, the movable baffle module includes skeleton and expansion plate heat sink, the skeleton is used to provide support for expansion plate heat sink, the rack is equipped with below the skeleton, the rack both sides symmetry is equipped with gyro wheel, drive direction module is equipped with vacuum motor, commutator and gear, the vacuum motor is the gear and provides power, the gear is cooperated with the rack on the skeleton. Its solved the existing large -scale space device or in orbit camera carries out the technical problem that radiation calibration is easy to be affected by blackbody temperature rise radiation, leads to radiation calibration result accuracy to drop. The utility model can be widely applied in vacuum ring mould equipment test.

Description

Technical Field

[0001] This utility model relates to a vacuum ring mold device, and more particularly to a movable baffle for radiation calibration in a vacuum ring mold device. Background Technology

[0002] Conducting thorough space environment simulation tests on the ground, and fully exposing various potential defects of products such as on-orbit cameras before launch, is of great significance for improving the reliability of aerospace products. During the radiometric calibration of large aerospace devices or on-orbit cameras (hereinafter referred to as products), blackbody radiation during the blackbody heating process can affect the product itself, thereby affecting the accuracy of the radiometric calibration results. Summary of the Invention

[0003] This invention addresses the technical problem that existing large aerospace devices or on-orbit cameras are easily affected by blackbody heating radiation during radiometric calibration, leading to a decrease in the accuracy of radiometric calibration results. It provides a movable baffle for radiometric calibration in vacuum ring mold equipment, which is placed between the blackbody and the product to effectively shield the product from thermal radiation during the blackbody heating process and improve the accuracy of the product's radiometric calibration results.

[0004] Therefore, the technical solution of this utility model is a movable baffle for radiation calibration in a vacuum ring mold device, comprising a base, a movable baffle module, a drive guide module, a limiting module, and a control module. The base is fixed on the bottom test platform of the space environment simulation test device. The movable baffle module includes a frame and an expansion plate heat sink. The frame provides support for the expansion plate heat sink. A rack is provided below the frame, and rollers are symmetrically arranged on both sides of the rack. The drive guide module includes a vacuum motor, a commutator, and a gear. The vacuum motor provides power to the gear, and the gear engages with the rack on the frame. The limiting module limits the movement trajectory of the rollers, and the control module controls the operation of the vacuum motor and the commutator.

[0005] The movable baffle module has two parts, left and right, and each movable baffle module is provided with a drive guide module; the roller includes a bottom guide roller and a side limiting roller, the limiting module includes a horizontal bottom surface and a side upper baffle, the guide roller is in rolling contact with the horizontal bottom surface, and the limiting roller is in rolling contact with the side of the side upper baffle.

[0006] Preferably, the drive guidance module further includes a backup vacuum motor and a reducer. The reducer is fixed on the motor bracket. Both the vacuum motor and the backup vacuum motor are connected to the commutator. The commutator is connected to the reducer. The gear is installed at the output end of the reducer.

[0007] Preferably, the speed reducer is provided with a heating film.

[0008] Preferably, each end of the base is provided with an anti-collision limiting structure, the anti-collision limiting structure is provided with a limiting block, the inner side of the limiting block is provided with a polytetrafluoroethylene pad, the upper part of the limiting block is provided with a mounting plate, the mounting plate is installed with a limit switch, the limit switch is a contact-type circuit breaker limit switch, and the contact-type circuit breaker limit switch is electrically connected to the control module.

[0009] Preferably, the roller is mounted on a connecting shaft, and bearing seats are provided on both sides of the roller on the connecting shaft. A bearing is provided in the bearing seat, and a heat-insulating PTFE outer ring is provided on the outer ring of the bearing. A heat-insulating PTFE plate is provided in the bearing seat.

[0010] Preferably, a liquid supply pipe is connected to the heat sink of the expansion plate, the liquid supply pipe provides liquid nitrogen to the heat sink of the expansion plate, the movable baffle module is treated with radiation shielding on the side facing the blackbody, and the movable baffle module is sprayed with black paint on the side facing the product.

[0011] Preferably, the height of the base is ≤350mm, and the motor bracket is fixed on the base.

[0012] The beneficial effects of this utility model are:

[0013] (1) By setting a movable baffle between the product and the blackbody, the movable baffle can be closed during the blackbody heating process, separating the product and the blackbody, avoiding the influence of the blackbody heating on the product, and improving the accuracy of radiation calibration.

[0014] (2) The moving baffle module is powered by a vacuum motor and transmitted through a reducer. Finally, the rack at the bottom of the frame is driven by a gear to move the moving baffle module in a certain direction. The drive guide module is also equipped with a commutator, which can realize the reciprocating motion of the moving baffle module and realize the opening and closing of the moving baffle module. The vacuum motor and the commutator are both remotely controlled by the control module.

[0015] (3) By setting a limit module, the roller can be limited to run within a specific trajectory, thereby driving the two moving baffle modules on the left and right to move along a predetermined route, realizing the merging and separation of the two moving baffle modules; the design of the anti-collision limit structure can prevent the two moving baffle modules from running beyond the predetermined trajectory, thus protecting the moving baffle modules.

[0016] (4) Due to the decrease in bearing clearance and increase in friction in low temperature environment, the motion mechanism is easily blocked. By installing heat-insulating PTFE outer ring on the outer ring of the bearing and installing PTFE heat insulation plate in the bearing housing, the influence of low temperature on bearing clearance and rotation is solved, and the operational reliability of the drive guide module is improved.

[0017] (5) This application achieves motion transmission by the cooperation of the gear of the drive guide module and the rack of the moving baffle module. Compared with the lead screw, it has a large load-bearing capacity and high transmission accuracy and speed. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 Enlarged sectional view of part A in the middle;

[0020] Figure 3 This is another three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the forward structure of an embodiment of the present utility model;

[0022] Figure 5 yes Figure 4 Enlarged view of a portion of point I in the middle;

[0023] Figure 6 yes Figure 4 Enlarged view of a section at point II;

[0024] Figure 7 This is a side view of an embodiment of the present invention;

[0025] Figure 8 yes Figure 7 A magnified view of the area from point B in the middle;

[0026] Figure 9 This is a three-dimensional structural diagram of the drive and guidance module according to an embodiment of the present invention.

[0027] Explanation of symbols in the diagram:

[0028] 1. Heating cage; 2. Low-temperature baffle; 3. Heating cage cable and metal tank chain; 4. Overall frame; 5. Low-temperature baffle and tank chain; 6. Skeleton; 7. Rack; 8. Gear; 9. Limiting roller; 10. Guide roller; 11. Side upper baffle; 12. Horizontal bottom surface; 13. Backup vacuum motor; 14. Commutator; 15. Vacuum motor; 16. Heating film; 17. Motor bracket; 18. Reducer. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments.

[0030] like Figure 1-8As shown, a movable baffle for radiation calibration in a vacuum ring mold device comprises a movable baffle module 2, a drive and guide module, a limit module, an anti-collision module, and a control module. One side of the movable baffle module 2 is a blackbody, and the other side is a large aerospace device or an on-orbit camera (hereinafter collectively referred to as the product). During the test, the movable baffle can be effectively opened and closed according to the calibration requirements. A heating cage 1 is mounted on the blackbody, and a metal tank chain 3 is connected to the heating cage cable. A baffle tank chain 5 is connected to the movable baffle module 2. Both the blackbody and the movable baffle module 2 are mounted on an overall frame 4. There are two movable baffle modules 2, left and right, each equipped with a drive and guide module. The movable baffle module 2 performs linear reciprocating motion on the horizontal plane through the drive and guide module, and also features a power-off locking function after reaching its destination, anti-collision and anti-collision protection functions, anti-tipping design, maintainability design, safety protection functions, and a remote communication interface.

[0031] Below the overall frame 4 is the base, which is fixed to the bottom test platform of the space environment simulation test equipment. The height of the base is ≤350mm. The base is welded from H-beams. Due to its large outer surface area, the gas outlet area is large in the vacuum environment, and therefore the gas outlet volume will also be large. Excessive gas outlet volume will affect the achievement of the working vacuum of the vacuum container and increase the gas extraction burden of the vacuum pumping unit. Therefore, before the H-beams are welded, the outer surface of all plates is mechanically polished to remove organic contaminants from the plate surface, and then welded. Important processing dimensions are precision machined after welding to reduce the gas outlet of the base in the vacuum environment.

[0032] The movable baffle module 2 includes a frame 6 and an expansion plate heat sink. The frame 6 provides support for the expansion plate heat sink, which is connected to a liquid supply pipe that provides liquid nitrogen. The liquid nitrogen supplied by the inlet pipe provides a 100K cold black background for radiation calibration, testing the thermal radiation of the product itself. Additionally, during the blackbody's heating and cooling process to stability, it effectively blocks the blackbody's radiation from affecting the product's performance, preventing temperature changes caused by blackbody radiation. A platinum resistance thermometer is installed on the movable baffle module 2. All structural components have smooth surfaces for easy cleaning, no enclosed spaces, and all components meet optical requirements with no oil contamination. The liquid nitrogen pipeline of the movable baffle module 2 does not contain unions. The side facing the blackbody is treated with radiation shielding, and the side facing the product is coated with a special black paint for the heat sink, which will not peel off over long-term use. Both sides of the movable baffle module 2 have effective heat insulation and radiation insulation treatment. The lifting points of the movable baffle module 2 are clearly marked, and matching lifting tools are provided.

[0033] like Figure 9As shown, the drive-guiding module includes a vacuum motor 15, a commutator 14, a backup vacuum motor 13, a reducer 18, and a gear 8. The vacuum motor 15 or the backup vacuum motor 13 provides power to the gear 8. The reducer 18 is fixed to a motor bracket 17, which is in turn fixed to a base. A heating film 16 is installed on the reducer 18 to heat the drive-guiding module and reduce the impact of low temperatures on its performance. Both the vacuum motor 15 and the backup vacuum motor 13 are connected to the commutator 14, which in turn is connected to the reducer 18. The gear 8 is mounted on the output end of the reducer 18. The control module can control the operation of the vacuum motor 15, the backup vacuum motor 13, and the commutator 18. To improve operational reliability, the drive-guiding module requires low-temperature testing in a low-temperature environment, and its transmission components undergo vacuum lubrication treatment using lubricating materials with low vapor pressure and low outgassing rate. Both vacuum motor 15 and standby vacuum motor 13 are equipped with integrated electromagnetic brakes for power-off locking: when power is off, the brake coil loses power, the electromagnetic force disappears, and the spring force pushes the brake pads to press against the friction surface, generating friction to firmly lock the rotor, thus achieving the locking function. A mutual exclusion function between the vacuum motor and the standby vacuum motor is added through the control module to ensure that the two drive guide modules will not appear in the same position simultaneously, avoiding collisions between the two moving baffle modules 2.

[0034] A rack 7 is located below the frame 6. A gear 8 meshes with the rack 7 on the frame 6. The movement of the gear 8 drives the rack 7, which in turn drives the movable baffle module 2. Motion transmission is achieved through the meshing of the gear 8 and the rack 7. Compared with a lead screw, this method has a larger load-bearing capacity and higher transmission accuracy and speed. Rollers are symmetrically arranged on both sides of the rack 7. The rollers include a bottom guide roller 10 and a side limiting roller 9. The limiting module includes a horizontal bottom surface 12 and a side upper baffle 11. The guide roller 10 rolls in contact with the horizontal bottom surface 12, and the limiting roller 9 rolls in contact with the side of the side upper baffle 11. By setting the limiting module, the rollers can be confined to a specific trajectory, thereby driving the two movable baffle modules 2 to move along a predetermined path, realizing the merging and separation of the two movable baffle modules 2. The movable baffle module 2 is powered by either vacuum motor 15 or a spare vacuum motor 13, and the power is transmitted through a reducer 18. Ultimately, gear 8 drives the rack 7 at the bottom of the frame 6, causing the movable baffle module 2 to move in a certain direction. A commutator 14 is also provided on the drive guide module, enabling the reciprocating motion of the movable baffle module 2 and facilitating its opening and closing. Both the vacuum motor 15 and the commutator 18 can be remotely controlled via a control module. The upper part of the frame 6 also has the same rollers and limit modules as the lower part to reduce the movement resistance of the movable baffle module 2.

[0035] Each end of the base is equipped with an anti-collision limiting structure to prevent the movable baffle module 2 from moving beyond a predetermined range. Specifically, the anti-collision limiting structure includes a limiting block with a PTFE pad on the inner side for cushioning. A mounting plate is also provided above the limiting block for mounting the limit switch. Based on past experience with limit switches in vacuum cryogenic environments, various mechanical limit switches have low reliability and are prone to jamming in low-temperature conditions. Therefore, the limit switch in this application adopts a contact-type circuit breaker limit switch, which has a simple structure and higher reliability. The anti-collision module design can prevent collisions when the two movable baffle modules 2 move towards each other, thus protecting the movable baffle modules 2.

[0036] The roller is mounted on the connecting shaft, and bearing seats are provided on both sides of the roller on the connecting shaft. Bearings are installed in the bearing seats. Due to the reduced clearance and increased friction of the rotating bearing in low temperature environment, the moving mechanism is prone to jamming. This application installs a heat-insulating PTFE outer ring on the outer ring of the bearing and a PTFE heat insulation plate in the bearing seat, which solves the impact of low temperature on bearing clearance and rotation, and improves the operational reliability of the drive guide module. At the same time, after all bearings and connecting shafts are assembled, a liquid nitrogen immersion low temperature test is performed. After continuous immersion in liquid nitrogen for one hour, the bearing rotation is tested to see if it rotates flexibly and if there is any jamming, further improving the operational reliability.

[0037] The control module measures the open / closed status, temperature data, and operating parameters of the moving baffle module in real time, and displays the collected data on the human-machine interface in real time. The control module has system self-test, fault diagnosis, and alarm protection programs. It monitors the operating status of each controlled object in real time, detects faults in real time, and automatically executes protection programs according to the fault level once a fault occurs.

[0038] This application can operate in a cold black vacuum environment with a temperature below 100K and a vacuum level below 1E-5Pa, enabling radiometric calibration of large aerospace devices or on-orbit cameras. When performing radiometric calibration in a vacuum cryogenic environment, a movable baffle module 2 is placed between the blackbody and the product. During calibration, the temperature range of the blackbody is 150K–400K. During the blackbody's heating process, the movable baffle module 2 is closed to isolate the product from the blackbody, preventing the blackbody's heating from affecting the product. After the blackbody reaches the set temperature, the product first acquires the radiation signal from the movable baffle to obtain the product's thermal radiation, which is then subtracted from the calibration data, improving the accuracy of the radiometric calibration.

[0039] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A movable baffle for radiation calibration in a vacuum ring mold apparatus, characterized in that, The device comprises a base, a movable baffle module, a drive and guide module, a limiting module, and a control module. The base is fixed to the bottom test platform of the space environment simulation test equipment. The movable baffle module includes a frame and an expansion plate heat sink. The frame provides support for the expansion plate heat sink. A rack is located below the frame, and rollers are symmetrically arranged on both sides of the rack. The drive and guide module includes a vacuum motor, a commutator, and gears. The vacuum motor provides power to the gears, and the gears cooperate with the rack on the frame. The limiting module limits the movement trajectory of the rollers, and the control module controls the operation of the vacuum motor and the commutator. The movable baffle module has two parts, left and right, and each movable baffle module is provided with a drive guide module; the roller includes a bottom guide roller and a side limiting roller, the limiting module includes a horizontal bottom surface and a side upper baffle, the guide roller is in rolling contact with the horizontal bottom surface, and the limiting roller is in rolling contact with the side of the side upper baffle.

2. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, characterized in that, The drive guidance module also includes a backup vacuum motor and a reducer. The reducer is fixed on the motor bracket. Both the vacuum motor and the backup vacuum motor are connected to the commutator. The commutator is connected to the reducer. The gear is installed at the output end of the reducer.

3. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 2, characterized in that, The speed reducer is equipped with a heating film.

4. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, characterized in that, Each end of the base is provided with a set of anti-collision limiting structures. Each anti-collision limiting structure is provided with a limiting block. The inner side of the limiting block is provided with a polytetrafluoroethylene pad. A mounting plate is provided above the limiting block. A limit switch is installed on the mounting plate. The limit switch is a contact-type circuit breaker limit switch. The contact-type circuit breaker limit switch is electrically connected to the control module.

5. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, characterized in that, The roller is mounted on a connecting shaft. Bearing seats are provided on both sides of the roller on the connecting shaft. A bearing is provided inside the bearing seat. A heat-insulating PTFE outer ring is provided on the outer ring of the bearing. A heat-insulating PTFE plate is provided inside the bearing seat.

6. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, characterized in that, The expansion plate heat sink is connected to a liquid supply pipe, which provides liquid nitrogen to the expansion plate heat sink. The movable baffle module is radiation shielded on the side facing the blackbody, and the movable baffle module is painted black on the side facing the product.

7. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 2, characterized in that, The height of the base is ≤350mm, and the motor bracket is fixed on the base.

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